This presentation aims to provide insights into the Super Charm-Tau Factory (SCTF) project in Russia and a detailed discussion on the design and optimization of the Time Projection Chamber (TPC) for the inner tracker of the Super Charm-Tau Detector (SCTD). The SCTF is a proposed e+e− collider with an energy range of 2–5 GeV and a peak luminosity of 1035cm−2s−1, dedicated to studying CP violation in charmed particle decays, testing the standard model in tau lepton decays, and exploring new forms of matter. The SCTD features a universal magnetic spectrometer, where the inner tracker plays a crucial role in locating secondary vertices from decays of short lived particles. Our study focuses on optimizing the TPC by selecting a suitable gas mixture, achieving high spatial resolution, and minimizing ion backflow (IBF). A detailed simulation of electron transport in various gas mixtures identified argon-based mixtures as optimal due to their high drift velocity and low diffusion. Further spatial resolution analysis showed that argon with 50% CF4 and argon with 40% CF4 and 15% CH4 achieved resolutions below 200 μm, meeting SCTF requirements. To mitigate IBF, we tested different Gas Electron Multiplier (GEM) configurations and found that a triple GEM stack incorporating a special GEM with an enlarged pitch significantly reduced IBF. These results provide critical insights for the SCTF TPC design, ensuring high tracking efficiency and precision. The proposed gas mixture and GEM configuration lay the foundation for a high-performance inner tracker, contributing to the broader goals of the SCTF experiment.
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